We don’t know that the amounts of radon found in residential environments is harmful because it’s never been studied. The claims about the number of deaths caus

We don’t know that the amounts of radon found in residential environments is harmful because it’s never been studied. The claims about the number of deaths caused are arrived at by starting with something we do have knowledge about - the massive amounts of radon in coal mines and it’s effects on miners - and then drawing a straight line on a graph, assuming there’s no threshold where radon risk drops to zero, and computing what share of lung cancer deaths would result from that model.